[The oldest theory of hemispheric specialization]

This paper is a sequel to the author's 'An ancient Greek theory of hemispheric specialization', Clio Medica 17 (1982) 33-38. It is concluded that the ancient Greek theory about functional cerebral asymmetry discussed in that article can hardly have been put forward before the third century B.C. It should therefore not be attributed to Diocles of Carystus (fourth century B.C.).